Chilled margin of pegmatite dike in grandodiorite. Note the coarse-grained nature of the dike near its center, and the fine-grained nature near the margin.
Chilled Margins
Chilled margin of pegmatite dike in grandodiorite. Note the coarse-grained
nature of the dike near its center, and the fine-grained nature near the
margin.
Chilled margin of mafic dike, Death Valley, CA. Here, the crystal size
is pretty fine-grained throughout the dike, but it is extra fine-grained
along the margin.
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